US PATENT SUBCLASS 137 / 637.4
.~.~.~.~ And reciprocating

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
637  DF  .~ Valves with separate, correlated, actuators {3}
637.2  DF  .~.~ Coaxial stems {1}
637.3  DF  .~.~.~ Rotary {2}
637.4.~.~.~.~ And reciprocating

DEFINITION

Classification: 137/637.4

(under subclass 637.3) Subject matter in which the other coaxial stem valve has a rectilinear motion with respect to its seat or port.